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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe7c45e52061b8487692b121f2f37e189dfa05f2f277bfd566660825ee9f2c37' 
  AND token = 'aLUjdbgMFn8HXheIILg22NXMpodZEOCtB2o9SyeRTHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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