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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7848d90a48839a2d9f231e456b5cc4a7f8f80f74ec18f341d2e4ae462083b4d7' 
  AND token = 'C/jHCJf6dKerVxQkl+0eTMdOe5j75KjP1mjmHf2MO0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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