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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6efc72624252585ba508ee28030b53780641d1c85b88f3f87d3623176261b54' 
  AND token = 'aBBkzr+3nkmWviDY6MZMWgWNMk7GgBlooLb1yNV2o30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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