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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '394388af57a9669f35d9a7deef08b6e622c1e41b0205d4b17cd0fc05eacc0b91' 
  AND token = 'J/YeLvdc5+5RCaoJhcbz9eMq0eTdzcXf/aw7NnrJfP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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