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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30340c9a3b6856aef27ca52661ca84d0c161b9087d5190e0e7bdbf38ff3afaef' 
  AND token = '9OUHqXpUJ6CWtU6SnHfDX0Dqoo8WM0vIVI2Hw12rOV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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