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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a592c1f428e3e89aed604f9b474fe07c78888b174ffe3dfae1a90747dc23165' 
  AND token = 'd20Xedon6yOsFEtp4V1EQdfy40JBusNJcvy53WLHBbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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