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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17740b8f989ad7be6954af573d93a19aa6c25260b2a29352ae8eab9dc80c8f53' 
  AND token = 'pmlGNRiSnbIbdvlcySCPOFng++pNhfjde/2i6ZbdU0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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