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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24a58fef86ffcc381167a6d4bb3bfc1a0050760819514eb99c65e88c24aafcbc' 
  AND token = 'VRcJUCIsleNlTSDFVFWV9TLRQNlETVXn5JojOlo5Vb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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