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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50cee194aa7c79adc8d013dc4365cbf389bef0dab5c8fb58ae9c75b09305f10f' 
  AND token = 'HeAA2sE89PrsT54BPTGgQSr27PTkhAQfJkxvpjooaV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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