SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93b5cd649257b20589a6e2906eea3f2f0f3b080a02878e53f023d10d82c1db54' 
  AND token = 'L06X25wAbpPGQh+nmzRtXC7YgOfjn87N5glHoBQ+VSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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