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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ccc8b9ff86520d8bee2dc46a4a5b2caea1b09527ce3a70cc4dfdb07e537af0d9' 
  AND token = 'vkrks4S9aS6xc+zPG74qX1xNtBQoBkbNc0iK/Rff2O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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