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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '531b67943cd4807a18e139190375eeb5b898efdf9abe24d1cde137caeba1f1c4' 
  AND token = 'N0jkpVnmIGRMertM/QlHMvVkl3eWAUy0+839YrNFD1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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