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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '963961da0283d899e33c35b7e217ddb6e3868e72c3fe665730cc375db8877875' 
  AND token = '1YNBwmrhh8ZDTcTdmx71HhGcuAM2VMbIGPvnMOmw3oI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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