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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aeeff7fc95685b98d5d88191284f83a4966d0239fe96ef41c4f83a21319cc9a3' 
  AND token = '0vX+pd8oABlvf3u2848nHpucU3VsT6fdB6nGB2kwNq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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