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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da91de1688bb41d54baa3ef7075d19cca7c919e0a67511fe9738c25f2c62aa6f' 
  AND token = 'pZ/ri5cHORiySATQs/uWweRy2wriUV66H1XDvl4SPL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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