SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '437256733f5d322b974b18ac4910e738a8dd00d3d92cf04ac4d84e7ffe9892fc' 
  AND token = 'LnMXOzevgjjx2LOa/bI3utQmMhUKb5qizC8w6UpZqEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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