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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ad49a5f6c41c87e8b98d0fa44d138817a8a987a6856ba33fc949fbf4be93239' 
  AND token = 'f7qr+GCrlcBq3AM34o/ABkEvOszdzusTT3s0T50ik38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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