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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa34f8850a591de481ed842ccb10616b165fbe635e56bf83ba49b2b055e667bd' 
  AND token = 'tYVaH7qNI1HLOfIq14s6O/XxvH+nmgN/wctAGc9OY78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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