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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e30e1b9224b2b06be0df573e226c2a55c43a22dea666a3dbfbd05bc9b9c1fba' 
  AND token = 'J9sQjDz/fBg8EQoGF/e+sPrEmyjddZPBtHD8Rg+gu60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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