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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e81a41b993c8b21657f746881985aa55e183c414e95944f88340fdcdf80554d' 
  AND token = 'qWW6/obd3vYt2pCDfPYHvSnA0F4/ySvbrhcd22w6kWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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