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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '192084a2e80642ab721b45a98f1adb39fa9ef266dc241d0d034426d8bf420110' 
  AND token = 'izRvAmSIxmzp2oWmV1X9iemKcQcGHKZxODnbbX2msRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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