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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '668f7df3ef93f0454828debc5ec076aa9d0f008ff84fe1e93423cb49de749f45' 
  AND token = 'hjFzBC7xJeI1PlsXObnz62yh4Dsp9m0xIWkC313wJD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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