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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55ccfd431a0ccd9b346a71c82517f598ff78ce8910a65455f0dea48d58760657' 
  AND token = 'AaIAHYquYsPCaqgEdxa3bVbn7QKTxu67k4jjPCCiM4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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