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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b89595a7de56c0e33e5d976cfaa682941d62c0729edbd20ae8a3fd49e139736c' 
  AND token = 'b5hi5GLzrWiqt09qnLZbLgl2iVTDqkVhvvL7mgABAPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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