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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a7b7c0f1419ebd1d27492c732abfff38337e35f7493ff8a26961748719182bde' 
  AND token = 'K7ZuazjnK8brrN2n7i0M9Qt8nyYMoN6phFsAxyhQWMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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