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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '79a42f878eb84e2622cbb304e7c3d5c4d4d4bf3b4494cac0ee87e4272cc0b4cb' 
  AND token = 'J7vojGPjgbOU8I20ggagg1EJhZsV/LlG06zVV5hiOp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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