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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '647bac576633bce166a103fd8054d0c48485dc3d5d3d042e49e179eda245981b' 
  AND token = 'qA1rXcTXFI717fC/GZLobPNP7ofB7zBAfwT9OHD8EH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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