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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fcb3e85676d2c66794ebfc9afd0d8a835c2dfa3795183eaf5dd71c0e7b8bf283' 
  AND token = '5H/HPEIZmfhDeSQ+qBCEBemT8ikX/h1x3SZEaZz3bCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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