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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3fd201c7407484a14c22c27e7c71f2a9ada045887bf997341416bc8289174a47' 
  AND token = 'FGRLO3zfuChRDc6jWVQWe2GC18t78HQBNoZQnsll4mM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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