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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '069895cdaa2c076510ad9df6fd0d42293d3b397c58d3b61bea95e67e01967234' 
  AND token = '1wra1F9fi96KnevB9dASjgMNM7j5AyidKR6kCFc9mcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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