SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e0ba1bfa9b2468bdb50ff0b0a7552c311be8f94f94a527f76da881c72ac4d15' 
  AND token = 'UdXoUPhdTskhGTWORXL+g2yqEE2eZW9p/VCcKWScBwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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