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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e8d990dc0546e95d45b4cf91038a7ce54499d35c05a2af62671027934392488' 
  AND token = '+UEMYX8wBEEwk0Numafd6itOZgJ7BYr83VeKOOv3QEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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