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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a08db1a037359018c947046054048b7fda8b4a4945fa83e0f43efc4aa735cecd' 
  AND token = '4gwuO6OKuqnR6BpvO3PZCJaBRJF30cWc++ObatnqKF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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