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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d778fc56044e011d4ab984d901ea564981f76e6b4f44ce8113c91708e5ae4c8' 
  AND token = 'Zw5HkL2tMRp7OqFN+egK4tNsAyp5J8AmCnL1nDbpMOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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