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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9aa4ba96c717fe5256655a4d9bd640a38186af888dbf561e7a065df28fc3319' 
  AND token = 'kbW4aim85sJ2B1P5EHAMuHn+tcVkDyGwFPc1ttEWmZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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