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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b70dd7432d8a5c5c908936d5d20f848234adbf4ea67fded8c3c21ff0f882baf6' 
  AND token = 'smFb3oKEN61EQcFw1actJi52clVOdDAcEVL2c6ZhT8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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