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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff58f4f570923195f53910081cafc48c9cd22e07ff96c1878a2a8eea57beac15' 
  AND token = 'N+EgVRNeUw3i7MAGw586K+iyUJgeXoyBAiVPy8qAXHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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