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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6731f44d1102303b38a47cecf0ce3b3b956a3c0edcff61c69ac51a236b51406d' 
  AND token = '8IN15rD8rkUzv447cEvguE4MvYXstHBBnzBXjIvd3aE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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