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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19a2fc30ad33cc1a2efc95bc80a0ca872313ed01b17a544bf1a307be556e27f1' 
  AND token = 'ZnggIxpyEjWjrSaQyD5Dhu6M+tii4M2Xt1i1pOBKE6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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