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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94f398a741e57c398665800d4805bb107d95320a3494377337ce6c846efb951b' 
  AND token = 'lHTP/9sHi8CLT2GUX/fwexQoCpnEezaHLsQ5Rq7UzNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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