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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a57fa75509f799f33f89707e018c9108f4453b4d98758c9e3e0b936b852e9f3f' 
  AND token = 'KgG0eKjqcG4TtAGBd2mvr38pyp1Yo6E5e38f3fS12UY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}