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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '529e211fb558081851c6e662ebd738e59f2f1517ce460a24b3810ec70d11cab3' 
  AND token = 'STlfDowbDcKvkho9C+XW0l1NRgba9mgL7ybgO5xQpsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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