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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9410748c4125180060caa078eff859cac45af1932866735b9fadc49c42eaccac' 
  AND token = '6wSOsi25lX5lKR5dsSXtZ3wVj3LXxIjaUI1Ofoz5CHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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