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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04e67b7f7f6fb0ea163c8362b0611f0478d85eebe65ed26830473ae32968c7cf' 
  AND token = 'eIOj6I2MCLR3f6cS1FoXWmmNSUmMQJ+SpxqreGyquB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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