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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3160c0c44ad1e248c2b9d6388fb73cd00805b6679d1079769c88fca5150dca1d' 
  AND token = 'S/1kDsGIgESCX7gF0VOfaELOVL0AzVSoLPNxJdNas1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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