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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7e751f1071392403811b40cfcabc8e39dc3486163fbcddd2c1f8a172410b899' 
  AND token = 'FnY7fJhqLPGpr1UIXRsEI3fxInugyjYtEAf2KRjMh00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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