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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a352ab38368a012ed2c44cecab22989c9d3afca40ebf10e712283aea2f1589f' 
  AND token = 'o48Rs4su3VpkzPKr2iqbpXbq0kg+4DAvvh7AC8kZfzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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