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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '711b73274d64969d1798a1cbabd4ec22e0d36ee9a6679c2eb38f10dbcbae2f0f' 
  AND token = 'X84GnPyGJdh2FoqaPRpk+9isNJ7fAS4ISnbJuGTOmjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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