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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '973c7afa31942e692b4f7ec3e32b83ed8a0ef97a012735ed1c5f634032bc03e1' 
  AND token = 'EyGEJDlDrxiMzXYFea1zgPoSeAaHcBY+KNh9hMhvquE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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