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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33939ee708170a3fe532933748f4f647fa7012798cae174dcfd781d9505a801c' 
  AND token = 'qxfYy0tkmSuusM5IzQ2RRoH4STa2iuDIHs9PzTM0Sko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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