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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef4cd2dfa986ddde86c4662c120eae1ec6d728af9e31b614c9bf108198247c2d' 
  AND token = '970BELxuRBAywS3w08xW54pagC50QQzkJWIkiH7rJPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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