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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd8c2b93651d3759aaa04e9d15c69fd899acbd72255393883fed35dd2dfa63a9d' 
  AND token = 'ht1zMSwrmClPN3r/lyjESX8Pv6N5/dft/Db2ezXfgZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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