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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef000ab09fbf129b880f428069b3324f9204ac0784e9c3c28576d37c88c367c2' 
  AND token = '9JrCuH/8Ygg1IsbdEu8wSFqSUSqiseDgkK7XKJeR4Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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