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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ea65f2be05dbc5332bb60e3b730fd09e4a002af86a8da9e2d1d11a1d4608e8a' 
  AND token = 'TJjcS0iA5dRTHY5RLyVQY2DXDSem81HHzGcv4ZapiNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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