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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3216e0fd5857aa3eaa5ce64c25767cd98e6a2e5a894d9e1c0f9612b0ad1c6058' 
  AND token = 'mPApgWMDlR8PVojTkzaAqM+oismT1md0OLTW06zSEN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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