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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68285c7f88d539dcf0a1adab8876fc9a6a0ed4c246789fa78cf88286c6d324fa' 
  AND token = 'SFIKrsRA32YuMzS9xJYgEolxIARwTxMcV8xOMyVpc78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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