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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3e06b9dadd26f18dff23673499295684c90e91f34df6650fd6fddb034896686' 
  AND token = '7Gt4rBfUabOqelpMFNsxE17lJh11IUmSLOrDRSKiGd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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