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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '262a750dc4a3808990f60265712cd00c7003d8505206dd1157a4a35298d72148' 
  AND token = '5HplFUivx/YUO6H6TzSNSrv/5cKS3TxC2zn/ceNOBgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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