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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18583820b4035961d877fcca7beffb0b21410bd355d30ced180b2fe05ad755ae' 
  AND token = '42e40ARS5Y2PBi+GHnpelJiK/aCdrRsf/aH6+k4vjE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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