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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e961c99c0056fc062fd2ac2fa12a003d9c8a66f97fb25ffeedbcf5bc560f7b7' 
  AND token = '39ykhxnT9SbFrouV3FHdgxm5a+Mykir3kqDyjgtGCWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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